Power Assist Systems. Dtc C1581 Assist Map Number Un-Writing

Steering. Yaris. Ncp93, 131

DESCRIPTION

The power steering ECU assembly outputs this DTC when it determines that the assist map is not written in the ECU.

DTC No.	DTC Detection Condition	Trouble Area
C1581	Assist map not written in power steering ECU assembly	Power steering ECU assembly CAN communication system ECM

If the power steering ECU assembly has been replaced, perform the torque sensor zero point calibration and assist map writing (YARIS_NCP93 RM000000OSZ018X.html).

1.PERFORM ASSIST MAP WRITING

NEXT

2.CONFIRM DTC

Check for DTCs (YARIS_NCP93 RM000001AL601KX.html).
OK:
DTC C1581 is not output.
HINT:
DTC C1581 will be cleared after the assist map is written.

END

3.CHECK CAN COMMUNICATION SYSTEM

Result
Result	Proceed to
DTCs is not output	A
DTCs is output (for Hatchback except Separate Type Yaw Rate Sensor)	B
DTCs is output (for Hatchback with Separate Type Yaw Rate Sensor)	C

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (YARIS_NCP93 RM000001RSO05UX.html)

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (YARIS_NCP93 RM000001RSO066X.html)

A

4.CHECK ECM

Check if an ECM that complies with the vehicle specifications is installed.
OK:
The ECM that complies with vehicle specifications is installed.

REPLACE POWER STEERING ECU ASSEMBLY (YARIS_NCP93 RM000002XN603ZX.html)

Yaw Rate Sensor Type	See Page
for Hatchback except Separate Type Yaw Rate Sensor	YARIS_NCP93 RM000001RSW02LX.html
for Hatchback with Separate Type Yaw Rate Sensor	YARIS_NCP93 RM000001RSW02PX.html